Didn't see it mentioned here yet, but for quick measuring, a pair of dial calipers. one 6", one 12". I use the long one to nail down pushrod lengths among other things.

2014 Durango R/T
2004 Dodge Ram 3500 SRW SLT short quad Cummins 6 speed
1998 Dodge Durango SLT 5.2
1971 Plymouth Duster-
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